Drawing-compasses.



G. SUHOENNEB.-

DRAWING GOMPASSES. urmonron FILED NOV.26,190'7.

v Patented Oct. 27, 1908;

2 SHEBTS-SHEET 1 //v V5 70 R I w x/AZ w I I ZZV/mw w r/vz sst's G. SGHOENNEB. DRAWING GOMPASSES. APPLIUATION FILED 1107.26, 1907.

Patented 0015 221908.

2 SHEETS-SHEET 2.

IN MFA/7'01? W/T/VESSfS GEORG SGHOENNER, OF NUREMBERG, GERMANY.

DRAWING-COMPASSES.

Specification of Letters Patent.

Patented Oct. 27, 1908.

Application filed November 26, 1907. Serial No. 403,910.

To all whom it may concern:

Be it known that I, Gnone SCHOENNER, manufacturer, subject of the German Emperor, residing at Nuremberg, Bavaria, Ger-,

many, have invented new and useful Improvements in Drawing-Compasses, of which the following is a s eciiication.

Compasses are a ready known in which the handle is always held in the centerline of the opening of the legs when the latter are opened and closed. In one known form of construction of such compasses, a disk is located between the lugs of the compasses head, while pins are inserted in the lugs which engage in slots and are guided therein.

The compasses forming the object of this invention differ substantially from this arrangement by the disk lying between the lugs of the head being provided with two studs or eXorescences, and the lugs with recesses or grooves with which the studs engage.

The improved com asses have several essential advantages 0" construction as compared with the ordinary ones, as while in the latter the insertion of the pins in the lugs of the compasses head and the formation of the slots in the disk is very difficult, in the former the grooves in the lugs of the compasses head and the studs in the disk may be made by punching and drawing so that the compasses are es ecially adapted to be manufactured 011 a w iolesale scale.

The invention is shown in the accompanying drawings, in which Figure l is a front view, partly in section. Fig. 2 is a sectional view taken at right angles to Fig. 1. Fig. 3 is a view similar to Fig. 1, but showing the compass open. Fig. 4 is a side view of the disk. Fig. 5 is a section on line AB Fig. 4. Fig. 6 is a front view partly in section showing a modification. Fig. 7 is a like view showing the compass open. Fig. 8 is a front view partly in section of another modification. Fig. 9 is a section taken throu h the center of Fig. 8. Fig. 10 is a view simi ar to Fig. 8 showing the compass open. I Fig. 11 is a side view of the disk used in the modification illustrated in Figs. 8, 9 and 10. Fig. 12 is a section on line A-B Fig. 11.

In the first form of the invention shown in Figs. 1-5, the disk I) lying between the lugs a of the head of the compass is provided with an elongated slot 0 through which the hinge pin d of the com ass arms 0 passes. On each side of the slot t 1e disk has a stud f, said studs being displaced relative to one another so that each of them faces one of the two head lugs. In the latter, recesses or grooves g are provided in which the excrescences or studs engage. The disk I? has at the ortionwhich faces the handle 71 attached to t e head yoke m, a projection h which enters a erforation Z of the handle 2', so that the disk cannotbe turned relatively to the compasses handle.

On the legs of the compasses, to which the disk I) always lies symmetrically by reason of the studs fitting in the grooves g, being opened the disk is pushed upwards, the projection h being displaced in the perforation Z of the handle and holding this also in a symmetrical position to the compass legs.

The second form of construction of the compasses Figs. 6 and 7, differs from the first by the disk I), lying between the lugs a of the compasses head, being prevented from turning relatively to the handle by a fork r embracing the bow or yoke m, and the arms of which slide up and down on said yoke 'm, when the compasses are opened and close instead of as in the first case, by a projection provided on the disk 6 lying between the lugs a of the compasses head.

In the compasses shown in Figs. 812 the disk I) is secured against displacement by a pin or shank p immovably held on the bow or yoke of the compasses head. This pin, which has at its upper end a clamp n which engages round the yoke, projects into a slot 0 in the disk. The disk I), which is perforated to allow of the passage of the joint pin (Z, slides along the pin 79 when the legs 6 are opened and closed. The grooves g impressed in the lugs a of the head are displaced through 180 relatively to the slots 9 in the compasses hereinbefore described, consequently the disk I) slides downwards and not upwards when the compasses are opened.

I declare that what I claim is A compass having a disk located between the lugs of the compass legs, said disk having a slot therein through which the pivot pin passes, a stud on each side of the disk, one

name :to this specification inthe presence of two subscrlbing Witnesses.

GEOBG SCHOENNER.

stud located on one side of the slot and one 0n the other, and said lugs of the compass legs having grooves therein adapted to engage With the lugs on the disk, and means 5 for connecting said disk with the compass head.

In testimony whereof I have signed my Witnesses:

LEONHARD KOERBER, H. W. HARRIS. 

